diff --git a/internal/testutil/service.go b/internal/testutil/service.go
index da2b71f..a7c26a1 100644
--- a/internal/testutil/service.go
+++ b/internal/testutil/service.go
@@ -9,22 +9,27 @@ import (
 	"git.defalsify.org/vise.git/db"
 )
 
+// TestStorageService wraps db for nats subscription.
 type TestStorageService struct {
 	Store  db.Db
 }
-	
+
+// GetUserdataDb implements urdt/ussd/common.StorageServices.
 func(ss *TestStorageService) GetUserdataDb(ctx context.Context) (db.Db, error) {
 	return ss.Store, nil
 }
 
+// GetPersister implements urdt/ussd/common.StorageServices.
 func(ts *TestStorageService) GetPersister(ctx context.Context) (*persist.Persister, error) {
 	return nil, errors.New("not implemented")
 }
 
+// GetResource implements urdt/ussd/common.StorageServices.
 func(ts *TestStorageService) GetResource(ctx context.Context) (resource.Resource, error) {
 	return nil, errors.New("not implemented")
 }
 
+// EnsureDbDir implements urdt/ussd/common.StorageServices.
 func(ss *TestStorageService) EnsureDbDir() error {
 	return nil
 }